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PREP07 Test 1
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The hognose snake puts on an impressive bluff, hissing and rearing back, broadens the flesh behind its head the way a cobra does, feigning repeated strikes, but, having no dangerous fangs and no venom, eventually, if its pursuer is not cowed by the performance, will fall over and play dead.
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When drafting the Declaration of Sentiments that was adopted at the Seneca Falls Women's Rights Convention in 1848, included in it by the author, Elizabeth Cady Stanton, was a call for female enfranchisement.
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PREP07 Test 1
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Polio, although it is eradicated in the United States, it continues elsewhere and is able to be brought into the country by visitors.
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PREP07 Test 1 OG18-语文分册 OG19-语文分册 OG20-语文分册
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Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies, using their power either to find and attack prey, to defend themselves, or also for communicating and navigating.
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PREP07 Test 1
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One report concludes that many schools do not have, or likely to have, enough computers to use them effectively.
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The Sports Medicine Programs of the Olympic Training Center, a complex where final tryouts are held for athletes representing the United States in the Olympics, is geared toward enhancing athletes' performance and toward their preparation for international competition.
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PREP07 Test 1
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The budget for education reflects the administration's demand that the money is controlled by local school districts, but it can only be spent on teachers, not on books, computers, or other materials or activities.
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PREP07 Test 1
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As a result of a supernova explosion, every human being on Earth was bombarded on February 23, 1987, by about 100 billion neutrinos; fortunately, neutrinos are harmless elementary particles that are produced in nuclear reactions and that interact very weakly with matter.
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PREP07 Test 1
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Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heat from the Earth's interior and producing energy on a commercial scale, enough for efficient generation of electricity and heating factories and homes.
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PREP07 Test 1
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The application of a new method for analyzing the chemistry of tooth enamel allows scientists to examine molars of prehuman ancestors and determining that their diets were more varied than had been supposed.
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PREP07 Test 1
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The continental United States receives an average of 30 inches of precipitation a year; transpiration from soil and from plants returns approximately 21 of the 30 inches to the atmosphere, while the balance of 9 inches contributes to the flow of streams and rivers.
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PREP07 Test 1
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1998 saw several new ventures promoting online distance learning both at the college and graduate level, but also faculty members in large numbers began questioning whether the computer screen was an adequate replacement for the classroom.
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Whereas scientists, because of random fluctuations in the weather, cannot determine the transition from one season to the next by monitoring temperatures on a daily basis, so they cannot determine the onset of global warming by monitoring average annual temperatures.
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PREP07 Test 1
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Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than are those that boys experience.
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PREP07 Test 1
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Shipwrecks are more likely to be found undisturbed at great depths than in shallow coastal waters, which exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be archaeologist, treasure hunter, or sport diver.
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PREP07 Test 1
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A new genetically engineered papaya was produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but university and United States Department of Agriculture researchers who allowed growers to use it free of charge.
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PREP07 Test 1
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Unlike emergency calls that travel through regular telephone lines, where they thus automatically inform the operator of the location and phone number of the caller, cellular calls require emergency operators to determine the location of the caller.
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PREP07 Test 1 OG18-语文分册 OG19-语文分册 OG20-语文分册
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Developed by Pennsylvania's Palatine Germans about 1750, they made Conestoga wagons with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent cargo from shifting on steep grades.
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PREP07 Test 1
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The proliferation of so-called cybersquatters, people who register the Internet domain names of high-profile companies in hopes of reselling the rights to those names for a profit, led to passing the Anti-Cybersquatting Consumer Protection Act in 1999, allowing companies to seek up to $100,000 in damages against those who register domain names with the sole intent of selling them later.
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PREP07 Test 1
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Paper production accounts for approximately 40 percent of the world's industrial use of wood, and the market for paper is growing faster than it is for all major wood products.
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